1655011665 has 48 divisors (see below), whose sum is σ = 2959257600. Its totient is φ = 855017856.

The previous prime is 1655011661. The next prime is 1655011681. The reversal of 1655011665 is 5661105561.

It is not a de Polignac number, because 1655011665 - 2² = 1655011661 is a prime.

It is a super-2 number, since 2×1655011665² = 5478127222572144450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1655011661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 395856 + ... + 400014.

It is an arithmetic number, because the mean of its divisors is an integer number (61651200).

Almost surely, 2^1655011665 is an apocalyptic number.

1655011665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1655011665 is a deficient number, since it is larger than the sum of its proper divisors (1304245935).

1655011665 is a wasteful number, since it uses less digits than its factorization.

1655011665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446 (or 4443 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1655011665 is about 40681.8345825259. The cubic root of 1655011665 is about 1182.8609276579.

The spelling of 1655011665 in words is "one billion, six hundred fifty-five million, eleven thousand, six hundred sixty-five".